Chain-feed saw.



W. GIERTSEN.

CHAIN FEED SAW.

APPLIOATION FILED JUNE 7, 1913.

1, 1 09,747. Patented Sept. 8, 1914;

WITNESSES WammZ/ww ATTORN EY 'IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII II I IIIIIIIIIIIII I! W. GIERTSEN. CHAIN FEED SAW. APPLIGATION FILED JUNE 7 1913.

Pafiented Sept. 8, 1914,

3 flHEETS-SHEBT 2. 51

0 lily I), IIIIIIII' I I III]! Waldeinarfi INVENTOR ATTO R N EY W. GIERTSEN.

CHAIN FEED SAW.

APPLICATION nun JUNE 7.1913.

1 1 09,747. Patented Sept. 8, 1914 3 SHEETS-SHEET 3.

ATTORN EY EINITED STATES PATENT OFFICE.

wmnm'nn emn'rsnn, or cnrcaeo, rtt'rnors.

CHAIN-FEED saw.

for feeding the work thereto and holdingthe work in engagement with a feed chain in close relation to the active portion of the saw, the present invention having to do with a machine in which the cutter is in the form of a circular saw. l

In the machine of the present invention the saw arbor may be supported in a manner permitting its adjustment up and down .With' relation to the feed chain, and the latter may be provided with a longitudinal groove into which the teeth of the saw will enter for a. short distance, so that the saw may completely sever the work where such is desired. a By the term saw it' is not to be understoo that the invention is. confined to the use of a single circular saw, for a gang of saws may be employed for certain character of work, the feed chain and other parts being correspondingly modified.

On each side of the saw in the direction of travel of the work are presser rollers designed to hold the work in close engagement with the feed chain, and these rollers are so mounted and constructed that they may engage the work in close relation to the active edge of the saw, the rollers being grooved to permit them. to partially embrace the saw where it is desired to cut short pieces of stock, while for long pieces these feed rollers are readily adjustable to engage the work at greater distances from'the saw.

The invention will be best understood from a consideration of the following de'-.

tailed description, taken in connection with the accompanying drawings forming a part of this specification, with thefurther understanding that while the drawings show a practical form of the invention, the latter is not confined to any strlct conformity with the showing of the drawings, but maybe changed and modified so long as such changes and modifications mark no material departure from the salient features of the invention.

Specification of Letters Patent. Application filed June 7, 1913. Serial no. 712,345.

In the drawings :-'Figure 1 is a plan view I of a portion of a machine embodying the present invention. Fig. 2 is a section on the line 22 of Fig. -1. Fig. 3 is a section on the line 3 -3=of Fig. 1', some distant parts being omitted. Fig. 4 is a front elevationof the saw carrying head and a portion-of the table underlying it. Fig. 5' is a section on the line 5,-5" of-Fig. 1. Fig. 6

drawn -on a larger scale. Fig. '7 is a section Patented Sept s, 1914..

-is a section on the line 66- of Fig. 4 but I through one of the presser roller carriers.

Referring to the drawings, there is shown a table l-provided with a slot 2 through which travels-a feed .chain- 3, this chain being made upof closely associated links having a roughenedengaging surface and each link is shown as provided] with a single longitudinal groove 4- matching I those of the other links" and in alinement therewith, so that the chain, which is an endless chain,

has a single longitudinal groove throughout its lengthn- This groove is to be taken as typical of either one or a' series of grooves,

since this feature is not broadly claimed in the present application, but inthe Nelson application hereinafter referred to.

- Rising above the table 1 is an arm 5 in overhanging relation ,to the table, and this arm is designed to support various structures .which enter into the present inven-- t1on Journaled on the arm is an arbor 6- havmg a pulley 7 at one end and the usual clamping means. 8 for a circular saw 9 at the other end, the'saw being so located that it overhangs the chain 3 with its cutting edge entering the groove '4 when it is desired to com letely sever the work. At the free end of t e arm 5, whichfor convenience. of description may be called the front end,

there is an upstanding .portion 10, which is provided with oppositely disposed beveled edges '11 in parallelism. Adapted to the upstanding end 10 of the arm 5 is a head 12 of considerably greater lateral extent than the end 10 of the arm 5, and this head has on its rear face oppositely disposed inf clined flanges 13 shaped to receive the bev-' eled edges 11 of the arm, so'thatthe head may be adjusted up and down on the arm,

while gibs 14 are introduced between the flanges 13' and beveled edgesll, one of these gibs being held by set screws 15, while the other may be engaged by a hand screw 16 threaded through the respective flange 13 so as to determine the degree of pressure with which the head is held to the arm extremity to take up all lost motion, as well as providingmeans for'clampingthe head tightly in place when desire The head 12 has lateral extensions 17 each provided with a longitudinal central slot 18 and dovetail guide tongues 19 on opposite sides of the slot 18, these tongues being em-v braced by dovetail flanges 20 on a respective carrier 21. Each carrler is formed with a rib 22 shaped to enter betweenthe tongues 19 and a hand screw 23 is extended through the slot 18 and is threaded into the rib- 22 so that the carrier may be adjusted to any desired point along the ribs 19 and. then locked in the adjusted position. To avoid lost motion and takeflup all wear in thedovetail connection between each carrier 21 and its supporting extension 17, there 'is provided-a gib 24 and set screws '25.

Each carrier 21, there being two such carriers, has a longitudinal central channel 26 formed therein, and this channel is closed by a face plate 27 while at what constitutes the upper end of the carrier there .issecured a head 28 continued into a neck 29. through.

which is threaded a screw rod 30 having a hand wheel 31' at the. upper end and at the lower end engaging a follower 32 hearing against one end of a spring 33 housed in the channel 26, while the other end of the I .spring bears against a stem 34 appropriately shaped to snugly .fit the channel and yet slide therein with freedom. It is customary to make the channel rectangular and. the stem. 34 is of corresponding shape. The face plate 27 is formed with a longitudinal slot 35 through'which there is passed a set screw 36 entering the stem 34to hold the latter in difierent positions 'of projection with respect to the lower end of the carrier.

The lower end of' the stem 34 is. formed with a laterally extended head 37 from opposite ends of which depend spaced arms 38' curving away from the longitudinal center line of the stem 34 after the manner of a caster wheel support, and the free ends of these arms carry an arbor 39 upon which is.

mounted a presser wheel or roller 40, this presser wheel having a central peripheral -.groove. 41 entering it for an appropriate distance, while the outer edge of the wheel may be roughened, as indicated at 42, either in the form of parallel ridges or otherwise,

although i the roughening is not obligatory. i The upwardly extended-end 10 of the arm 5 carries a bracket-43 which may belocated between the 'fianges 13 on what may be termed the rear face of the extension 10, and this bracket terminates in a rack segment 44.. Fast to the bracket 43 are other spaced brackets 45 each at the. upper end terminating in a bearing'46 for a shaft .47 which at the ends outside of' the bearings 46' carries grooved pulleys 48 to each of Which there is secured one end of a chain 49 wound partly about the pulley and at the other end connected to a respective flange 13 as bya book 50, or in any other suitable manner. Theshaft 43 has secured thereto one end of an arm 51, the other end of which overhangs the arm 5 and is provided with an adjustable weight'52, the tendency of the weighted arm being to rotate the shaft 47 in a direction to wind the chains 49 about the pulleys 48 and thereby raise the head 12. To lower this head against the action of the weighted arm there is provided a lever 53 pivoted atv 54 to the center of the rack 44, and this lever carries a thumb latch. 55 in position to engage the teeth of the rack 44. The leverhas a short arm 56 connected throughany one of a series of holes 57 to a link 58 containing. said holes, while one end of the link is pivoted to a strap 59 made fast to the head 12. By this means the head 12 may be lowered against justed, the saw has its teeth entering the 'groove 4 when it is desired to completely sever the workand the presser rollers 40 are adjusted as close-to the center of the saw asthe depth of the grooves 41 will permit, so that the active portions of the rollers engage the work in close relation to the cutting edge of the saw and may, therefore, engage and hold work which is but little longer than the width of the saw. These rollers have their arbors 39 each connected to a drive shaft 61 through an intermediate connecting shaft 62 joined at the adjustment of the carriers 24 along the extensions 17. The shafts 61 are connected together for rotation in the same direction ends of the arbor 39 and shaft 61 by respective universal couplings 63 .to allow for the by sprocket-wheels 64 on each shaft and a sprocket chain 65, while the shafts may be driven through suitable gearing engaging a pinion 66 on one of the shafts 61. These rollers may be driven with a peripheral speed agreeable to the rate of travel of the chain 3, so that the work is engaged on op posite faces and propelled without slippage. The head 12 may be raised or lowered by manipulating the lever 3 to accommodate the presser, rollers to work of different thicknesses, while the springs 33 may regulate the grip of the rollers upon the work, the

tension of the springs being determined b y the screws 30, and while the set screws 36 need only serve as means for preventing the rollers 40 from dropping too far, they may also look the rollers in position when yielding pressure is not necessary.

While in the drawings the presser rollers are shown in closer relation to the saw arbor than the supports or stems 34, the presser rollers may be placed in more distant relation to the saw than the supports 34 by reversing the latter in the carriers 24. The various adjustments provided admit of the use of circular saws 9 of different diameters which is of advantage under some conditions. 1

The invention herein described is intended as an improvement on the invention shown, described and claimed in the application of Arthur W. Nelson, Serial No. 663,094, filed November 29, 1911.

What is'claimed is 1. In a machine of the class described, the combination with a circular saw, and a chain traveling beneath the saw and presenting a flat working face for supporting material fed to the saw, and a presser roller located.

above the chain and peripherally grooved for the entrance of the cutting edge of the saw ,and projecting inwardly under the same so as to engage the material close to r the active portion of the saw.

2. In a machine of the class described, the combination with a circular saw, of a feeding chain traveling beneath the saw and presenting a fiat upper face to the work, said saw extending into the feeding chain below the working face thereof, and a presser roller located above the chain and peripherally grooved for the entrance of the cutting edge of the saw, whereby the roller is adapted to project inwardly under the circular saw and engage the work close to the active portion of the same.

3. In a machine of the class described, the combination with a circular saw, and a feeding chain traveling beneath the saw and presenting a flat working face to the material fed to the saw, a presser roller peripherally grooved for the entrance of the teeth of the saw thereinto and provided with a supporting member in which the presser roller is journaled, said supporting member having a stem and arms in embracing relation to the roller and extended away from the center line of the stem to arrange the roller in a projecting position beneath the saw in close proximity to the active portion thereof.

4. In a machine of the class described, the combination with a circular saw, and a chain traveling beneath the same, of a head and support therefor upon which the head is adjustable up and down, said saw being mounted on the support, carriers on the 'head adjustable laterally thereof, and

presser rollers mounted on the said carriers and located in advance and 'inrear of the saw, the presser rollers being each peripherally grooved to receive the cutting edge of the saw, whereby the rollers are adapted to project inwardly under the. saw for engaging the material close to the active portion of the said saw.

5. In a machine of the class described, the'combination with a circular saw, and a feeding chain traveling beneath the saw, of an arm supporting the saw, a head mounted on the arm to move up and down with respect thereto, a shaft journaled on the arm and provided at opposite sides thereof with pulleys and having a counterweight, flexible connections between the pulleys and the said head, a lever carried by the arm, connections between the lever and the head for raising and lowering the head, and presser rollers carried by the head and located in advance and in rear of the saw.

6. In a machine of the class described, the combination with a circular saw, and a feeding chain traveling beneath the same, of pressure rollers each peripherally grooved to receive the cutting edge of the saw and provided with a supporting member with the axis of the roller displaced laterally with respect to the center line of the supporting member, the latter being reversible to arrange the presser roller close to the saw or in more distant relation thereto.

7 In a machine of the class described, the combination with a circular saw, and a feeding chain traveling, beneath the saw, of presser rollers each peripherally grooved to receive the cutting edge ofthe saw and each provided with a supporting member with the axis of the roller displaced laterally with respect to the center line of the supporting member, and a carrier for the supcombination with a circular saw, of a feeding chain composed of an endless series of links, each provided with a centrally arranged groove extending the entire length of the links and registering) with the grooves of the adjacent links to form in the active run of the saw a continuous groove into which the teeth of the saw extend, and a presser roller located aboveand coacting with-the chain and provided with a centrally arranged peripheral groove receiving the cutting edge of the saw to permit the roller to project inwardly beneath the said saw for engaging the material close to the active portion of the said saw.

press-er roller located above the feeding chain and peripherally grooved to receive the cutting edge of the saw and roughened at opposite sides of the groove to coact with the chain in gripping the material.

10. In a machine of the class described, the combination with a circular saw, and a feeding chain traveling beneath the saw, of a presser roller peripherally grooved at its center, the grooves being of a depth to wholly receive the teeth of the saw and having a width to permit the saw to work in the groove without contacting with the walls thereof, the peripheral face of the roller being roughened at each side of the groove.

11. In a machine of the class described, the combination with a circular saw, and a chain traveling beneath the same, of a supporting head, arbors carried by the head and located in advance and in rear of the saw, presser rollers mounted on the said arbors, power mechanism, connecting means including universal joints for connecting the power mechanism with the arbors, and means for adjusting the presser rollers toward and from the saw.

12. In a machine of the class described, the combination with a circular saw, and a feeding chain traveling beneath the saw, of

an adjustable supporting head, carriers slida-ble inwardly and outwardly on the supporting head with respect to the cutting edge of the saw, arbors mounted on the carriers, presser rollers fixed to the arbors, power mechanism, and connecting means including universal joints for connecting the power mechanism with the arbors, and means for raising and lowering the supporting head.

13. In a lnachine of the class described, the combination with a circular saw,and a feeding chain traveling beneath the saw, of carriers located in advance and in rear of the saw, arbors journaled on the car riers, presser rollers mounted on the arbors, power mechanism, and connecting means including universal joints for connecting the power mechanism with the arbors, said connecting lllilllS permitting independent adjustment of the carriers With their presser rollers.

14. In a machine of the class described, the combination with a circular saw, and a feeding chain traveling beneath the saw, two peripherally grooved presser rollers located in advance and in rear of the saw and adapted to have the teeth thereof project into their grooves, shafts, connecting means including universal joints for connecting the shafts with the presser rollers to permit independent adjustment of the latter, and power driven mechanism for rotating the shafts in unison.

In testimony, that I claim the foregoing as my own. I have hereto affixed my signature in the presence of two witnesses.

WALDEMAR GIERTSEN. lVitnesses RALPH B. GROVE, LILLIAN MANSFIELD. 

